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(11) | EP 0 677 965 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Partial response trellis decoder |
(57) A partial response Trellis decoder which is concerned with a trellis coded modulation
in a high definition television (HDTV) having a specific and detailed configuration
includes a distance mapper for calculating first, second, third and fourth Euclidean
distances from input signals from which NTSC interference is removed, a Viterbi decoder
for Viterbi decoding the first, second, third and fourth Euclidean distances output
from the distance mapper, a delay means for delaying and outputting the data output
from the Viterbi decoder for each step, a ruler selector for selecting ruler type
signal depending on the signals output from the delay means, and a slicer for slicing
depending on ruler type signal selected in the ruler selector and the input signals
from which NTSC interference is removed. |